I'd be angry to. Why the heck are there not a constant stream of buses running out of the PATH terminal? They are not electric, sure the roads are packed, but run bus shuttles to NJ and Jaimaca(major rail transfer station in Long Island). The trains may have trouble running out of Penn Station because the long tunnels require electric trains and prohibit diesels, but east of Sunnyside and Jaimaca they can use diesels to pull the trains. Setup generators at a few key fueling stations to keep the shuttles running. Don't they have a contingency plan for such an evacuation?
Emergency bus operations in a situation like this are severely constrained not only by the number of buses in their fleet, but by the number of bus drivers that can make it to the bus garage in a given time. If New Jersey Transit operates 1,200 buses system-wide during the evening peak hour, they aren't likely to have another 800 lying around to use in a case like this. And even if they did, they don't have 800 bus drivers on the payroll waiting for incidents like this to occur.
You're not taking into account all the electric trains sitting dead on the tracks they need to pass, like the one I was evacuated from.